A good backup serves a few purposes. It should help you recover from accidentally deleted files, a crashed hard drive, or something as serious as a site-wide catastrophe. But the only way to ensure that last one is to keep a backup offsite. Do you bother?

There are a lot of options for keeping an backup offsite? You can use an online backup service; we've even rounded up your five favorites. Some of them let you store full backups of your computers online. Others, like CrashPlan, provide a little more flexibility, letting you also perform local or network backups and even backing up to the computer of another person using CrashPlan. And if you're hesitant to back up online, you can also use physical media like DVDs or external hard drives that you store in another location. So, what about you?